In Fig. 8-78, a \( 3.5 \mathrm{~kg} \) block is accelerated from rest by a compressed spring of ...

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In Fig. 8-78, a \( 3.5 \mathrm{~kg} \) block is accelerated from rest by a compressed spring of spring constant \( 640 \mathrm{~N} / \mathrm{m} \). The block leaves the spring at the spring's relaxed length and then travels over a horizontal floor with a coefficient of kinetic friction \( \mu_{k}=0.25 \). The frictional force stops the block in distance \( D=7.8 \mathrm{~m} \). What are the increase in the thermal energy of the block-floor system,
Figure 8-78
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